Combined type-writing and computing machine.



F. A. ROBINSON. CGMBINED TYPE WRITING AND COMPUTING MACHINE. APPucA'TeoNman Aue.3o. 1913.

1,294,587. u Patented Feb. 1 8, 191e.

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UNITED STATES PATENT OFFICE.

FRANK 'A. ROBINSON, OF BROOKLYN, NEW YORK, ASSIGNOR TO UNDERWOOD COMPUT-ING MACHINE COMPANY, OF NEW YORK, N. Y., A CORPORATION `OF NEW YORK.

COMBINED TYPE-WRITING AND COMPUTING MACHINE.

Specification of Letters Patent.v l Patentd Feb. 18,1919.

Application filed August 30, 1913. Serial No. 787,403.

T 0 all whom t may concern.'

Be it known that I, FRANK A. ROBINSON, a citizen of the United States,residing in Brooklyn borough, city of New York, in the county of Kingsand State of New York, have invented certain new and useful Improvementsin Combined Type-Writing and Computing Machines, of which the followingis specification.

My invention relates to computing machines, and is herein shown asapplied to a combined typewriting and computing machine of theUnderwood-Wright type. In such machines the carriage of the typewritercauses a computing machine carriage to travel so that a master wheelengages scratz'm the computing wheels of a totalizer, said master wheelbeing power-driven, s0 that it turns said wheels to cause said totalizerto register the numbers written by the numeral keys of the typewriter.

For the purposes of the present improvements, such combined machines maybe provided with a plurality of master wheels and totalizers, and mayalso include a second computing machine carriage which controls therelation of another power-driven master wheel to another totalizer. Thissecond computing machine carriage may be connected so as totravelintermittently with the typewriter carriage in each letter-feedingtraverse of said typewritercarriage, and thus said second computingmachine carriage may cause the master wheel which it controls to docross adding in its totalizer.

The first-named totalizers may be operated by master wheels fast on asingle shaft, and said totalizers may be so adjusted on the carriagethat as the typewriter carriage travels along these totalizers may besimultaneously operated by said master wheels, or may be separatelyoperated thereby.

When two totalizers are thus simultaneously operated, one may alwayssubtract when the other adds. The result of this is that when thenumeral keys are operated to register in these two totalizerssimultaneously, said keys will take out of one totalizer the number1which is inserted into the other. This combination of two totalizersoperated simultaneously fromV a single master wheel shaft is especiallyvaluable in such work making out bills, where it is desired to items onetotalizer, and when ing of the items has been verified,

the total of said items may be transferred into a grand total totalizer.The accuracy of such a transfer may be proved bysimultaneouslysubtracting the number shown therein out of the item totalizer, thusbringing its wheels to register Zero. The fact that the wheels register`zero in the item totalizer is proof that the number has been correctlyregistered in the grand total totalizer.

lf these two totalizers, as suggested above, are operated by masterwheels fast on a single shaft, there are no connections between said twototalizers which an operator might. accidentally set wrongly. Thus saidstructure prevents such mistakes as an operator might make in manuallysetting connections to effect the same result.

If the cross totalizer is connected to be operated simultaneously witheither of the other totalizers, it may be connected so as to either addor subtract the numbers registered in either or both of said totalizers.

In one form of structure, items while be ing written on a bill, arefirst added simultaneously on the item totalizer and on the crosstotalizer; then when the total thus obtained is transcribed on the bill,it is subtracted out of `the item totalizer while the cross totalizer isineffective, but while the grand total totalizer is eiective. This, asabove described, brings the item totalizer to zero and thus forms acheck on the accuracy of the work.

Any credits may now be written so as to be inserted in a credittotalizer and simultaneously deducted from the cross totalizer. Afterthis is done, the cross tot-alizer will show the balance. Said balancemay now be transcribed on the bill and the numeral keys may be soconnected that transcribing. said balance will subtract said balance outof the cross totalizer, thus bringing the numeral wheels of said crosstotalizer to Zero, and proving the accuracy of said transcribing.

From the above outline, it will be observed that while my invention neednot complicate the machine with a large number of automatic shiftingdevices, yet it does provide the machine with a su'tlicient number oftotalizers so linked together that the tracing out of an error is afairly simple matter through all the stages of making out a bill, andthat the operator is able to llO prove the accuracy of his work atvarious stages by the fact that when said work is correctly done, thewheels of certain totalizers will stand at Zero.

Other features and advantages will appear hereinafter. y

In the accompanying drawings,

Figure 1 isva perspective front view of the upper front portion of anUnderwood- Wright combined typewriting and computing machine showing thepresent improvements and enough of the computing machine. to show howthey are connected thereto.

Fig. 2 is a sectional side view of a totalizer.

Figs. 3 and 4: are views partly broken away, showing the arrangement ofthe numerals on two totalizers seen together in Fig. 1.

Fig. 5 is a View of an alternative form in which the two totalizers arecombined.

Fig. 6 is a diagram spread out to show the connections when writing inthe first column.

Fig. 7 is a similar diagram showing the connections when writing in thesecond column, as shown in Fig. 1.

Fig. 8 is a similar diagram showing the connections when computing inthe third column.

Fig. 9 is a similar diagram showing the connections when computing inthe last or total column.

Fig. 10 is a similar diagram showing the connections when computing inthe next to the last or credit column, including also a totalizer forsaid column.

' In adapting the machine for a particular style of work, I employ atemporary or sub-totalizer 2 on which items are to be footed as written,and a permanent main or grand totalizer 1 on which the footings of theitems are to be transferred. Said totalf izers are so arranged that thedial wheels 3 therein are engaged Serzcttz'm by master wheels 1 and 5.For convenience the machine is illustrated as adapted to make out billswhereon are shown the items of sales for each day, the total of saiditems, the credits of the day, and the total daily bal ance. For thispurpose a bill 6 is passed around the platen 7 of the typewriter, andthe amounts are written out on said bill by the usual numeral keys ofthe typewriter, not shown herein, in any usual or desired manner, saidkeys operating the usual types. Said platen 7 is mounted in the usualUnderwood typewriter carriage 8 and said carriage carries along with it,as it moves in either direction, a computing machine car riage 9 towhich it is attached by a removable arm 10. On this computing carriagethe totalizers 1 and 2 are suitably adjusted by clamps 11, so that whenthe operator shifts the typewriter carriage 8 to write in any column onthe bill 6, the totalizers will be moved with said carriage, and ifeither then engages with one of the master wheels 4L or 5, saidtotalizer will register the number which is being written by the numeralkeys of the typewriter.

The machine, as shown herein also comprises a second computing carriage12,which is arranged to be intermittently connected to the typewritercarriage in such a way that numbers written in a plurality of columnswill be registered on a third totalizer 13 in a manner determined bysaid second computing carriage 12; said second computing carriage 12 maybe connected to the typewriter carriage in the manner disclosed in theco-pending case of Valter lright, Serial Number 574,813, filed August 1,1910, wherein the usual tabulating rack bar 14 of the typewritercarriage has settable there on lugs 15 preferably formed as extensionsof tabulating stops 16 (which stops coperate with the usual countorstops not shown) said lugs as they travel along with the typewritercarriage to the left intermittently intercept a hook or latch 17, saidhook formed on the end of a draw rod 18, which draw rod, by means of alever 19 pivoted intermediate its ends, moves the computing carriage 12to the right as the typewriter carriage 8 moves to the left. Saidcomputing carriage 12 includes a master wheel 20 slidably splined on apower shaft 19a, which master wheel 2O is normally drawn by a spring 21lattached to the lever 19 so as to stand a letter space or two above thehighest computing wheel 3 of the totalizer 13. Vhen, however, the hook17 is caught by one of the lugs 15, the master wheel. 20 is drawn to theright with each letter-feeding movement of the typewriter carriage toengage serz'at'z'm with the computing wheels 3 of the totalizer 13 untilthe master wheel 20 would pass 'beyond the units dial wheel 3 of thetotalizer 13. At this moment the hook 17 is drawn out of engagement withthe lug 15 by a cam 21 on its surface, said cam riding down under areleasing pin 22 which carries the hook 17 clear of the lug 15, thuspermitting the spring 21a to draw the master wheel 2O above the highestcomputing wheel.

In the present illustration, it is assumed that on some previous dayitems shown in the second column 23 of the bill 6 have been registered,said items being $2.00, $1.25 and $20.00, making a total of $28.25,which has been written in the third or daily total col umn 2i, andfinally carried out into the daily balance or last column 25 of the bill6. Said bill comprises a leaf 26, and a stub 27, said leaf beingattached to said stub at the perforated line 28, so that the leaf at anysuitable time may be detached from the stub and sent to the customer.Said leafis folded over at the perforated line 28, and a carbon paper,not shown herein, is interposed between said leaf and the stub, so thata complete copy of the bill will be kept on the stub to -be retained inthe office. Said stub may be used partly for verifying the work oftheoperator. For this purpose the stub is made to extend somewhat to theleft of the bill as viewed in Fig. 1, and on a check column 29 of thisstub, at the beginning of making out the bill for the day, the operatorcopies the total shown in the previous daily balance, which in thepresent instance is $23.25. The copying of this total onto the stub isarranged to automatically register the amount in the cross totalizer 13,diagrammatically shown in Fig. 6. The connections for accomplishing thisinclude a lug 15a set at the left-hand end of the typewriter carriage 8(see Fig. 1), which when the check column 29 is moved to position at theprinting point will, by the previously described connections, draw themaster wheel 20, so as to cause the number Written by the numeral keysof the typewriter to be registered in the totalizer 13. This: transfersthe previous daily balance into said totalizer. The operator then maymove the typewriter carriage along, bringing` the item column 23 to theprinting point, and then write the items $1.00, $.50 and $10.00, which,as shown in Figs. 1 and 7, will be registered in the totalizer 2, by themaster wheel 4 and also ,i added to the $23.25 previously shown in thecross totalizer 13, said cross tot-alizer being at this point connectedto the typewriter carriage by al lug 15b on one of the stops 16, as seenin Fig. 1.

The operator neXt moves the typewriter carriage to insert in the dailycharge column 24 the total shown in the item totalizer 2. Before sowriting this total, the operator shifts a lever 30 to throw over areversing clutch 31 (see Fig. 8) in the computing train between thenumeral keys and the master wheel shaft 32, on which the master wheel 5fast, thus causing said master Wheel to beturned in the oppositedirection when the daily total is written in the daily total column 24.

The lmaster wheel 4, which now engages the grand totalizer 1, isarranged to add into the daily total or grand totalizer 1 the dailyftotal which is being subtracted from `the totalizer 2. To bring aboutthis result the two master wheels '4 and 5 are fast on the same shaft32, but the numerals 33 on the dial or numeral wheels of the totalizer 2(see Fig. 3) are arranged in the opposite order from` the numerals 34 onthe dialV wheels 3of the totalizer 1 see Fig.4). The result Vof thisarrangement, as is obvious,

causes a number added in the one totalizer to be subtracted from theother,when the operator having no further items to record,

shifts the typewriter carriage so as to write the balance or total shownon the cross totalizer 13 on the bill in the column 25. J ust beforewriting said amount, the operator (see Fig. 9) shifts the handle 35 of areversing clutch 36 in the computing train between. the nume-ral keysand the master Wheel 20, so as to cause any number written by thenumeral keys to be subtracted out of said cross totalizer 13.

The operator now in writing the balancel $34.75, shown in said crosstotalizer, automatically subtracts out or erases said bal-v ance fromthe totalizer, thus inishing the operation on that bill for that day.This leaves the item tot-alizer 2 and cross totalizer 13 at zero.

Ony some later day the opera-tor is instructed to make a cash credit of$10.00 on this bill. To do this the operator proceeds as before to copyonto column 29 of stub 27 the last daily balance, $34.75 shown in column25, in the manner shown at the diagram in Fig. 6, and as described forthe total $23.25 above. It should be remembered that this is done withthe clutch 36 set at adding, as seen in Fig. 6. This, as abovedescribed, will register said previous daily balance in said totalizer.The operator now shifts the typewriter carriage to bring the printingpoint at the credit column 37. This connects the computing machinecarriage 12 -to the lug 15C, which corresponds to the column 37, causingthe numbers written in said column to be registered .in the crosstotalizer 13. Before writing in said column, the operator shifts thelever 35 to subtraction, as shown diagrammatically in Fig. 9,

leaving the shift lever 35 set at subtraction (as in Fig. 9), he'copiesin said column 25 the balance shown on the cross totalizer 13. Thissubtracts said dailybalance from said totalizer, thus bringing theWheels therein to zero, and proving the result by the fact` that thewheels are brought to Zero.

There being no Vhen it isdesired to have a separate totalizer for thecredit items which are entered in column 37, the Connections may be madeas shown diagrammatically in Fig. 10, wherein the credits totalizer isshown at 55 arranged to be operated by a master wheel 56 on the shaft 32on which shaft master wheels 4 and 5 are likewise fast.

As has been described above, the items of column 23 are footed up ontotalizer 2, said totalizer being operated by the master wheel 4. Towrite in the next column, the typewriter carriage is positioned to bringthe totalizer 1 over the master wheel 5, which simultaneously shifts thetotalizer 2 to a master wheel 57. The clutch reversing levers 30 and 35are shifted to set them as seen in Fig. 7 as described above, and theoperator in now writing the daily total in column 24 will, as describedabove, erase the total shown in totalizer 2, and adds said total to thetotalizer 1. If the operator wishes to enter a credit in the creditcolumn 37, he moves the typewriter carriage to write in that column,thus bringing the credit totalizer 55 to a point where it is engaged bythe master wheel 56 on the master wheel shaft 32. If both the clutchreversing levers 30 and 35 are set at subtraction, said credit item willbe added in the credit totalizer 55, and subtracted from the crosstotalizer 13. This is accomplished by having the numerals on the numeralwheels 83 of said totalizer running in the same direction as they do inthe totalizer 1. Having said numerals arranged this way is not essentialbut preferable, because it enables one shifting of the reversing lever30 to be dispensed with in writing a credit.

It will be understood in the above outline that the cross totalizer hasbeen connected up by means of the lug 15c in the manner described foroperating a machine where there is no credit totalizer employed. Saidcredit totalizer has the same kind of carry-over assisting roll 49 as isprovided for the other totalizers.

It will be observed that the amounts shown in column 29 of the stub 27are merely check numbers to show that the operator in working with eachbill started the computation for that day correctly. Furthermore, wheneach bill is removed from the machine with its balance carried out intothe daily balance column,the totalizers 2 and 13 will both stand atZero, if the work has been done correctly.

The grand totalizer 1, when each bill has been removed, will show thetotal of the charge items on the bills made out or eX- tended on themachine during the day. At the end of the day, said total may be copiedout onto a daily sales slip by inserting said slip in the machine,placing the shift lever 30 to cause the number registered in the grandtotalizer 1 to be subtracted out, and then copying said total onto thedaily sales slip. If this is done correctly the totalizer 1 will bebrought to zero.

One of the advantages of my invention is that both sub-totalizing andgrand total-k izing can be performed while cross-adding issimultaneously being automatically done, and all these operationsrequire the use of only two master wheel shafts. The result of havingtwo totalizers operated by a single master wheel shaft so that incertain columns one always subtracts while the other adds is obvious,since this enables the operator to always positively trace out anyerrors that may be made in transcribing, for neither the sub-totalizernor the grand totalizer can be reversed independently of the other. Thusthe correction ont an error in one will automatically correct the errorin the other.

The master wheels of the present invention may be driven by power, asdisclosed in the patent to Degener, No. 1,020,082 of March 12, 1912,wherein the motor, not shown herein turns the drive shaft 39 to whichthe clutches 31 and 36 are splined, to an extent determined by thenumeral keys depressed.

The totalizers shown herein are of the same general type as those setforth in said Patent No. 1,020,082. Each numeral wheel 3 is constantlyin mesh with its computing wheel 40, said computing wheel havinginternal teeth 41, through which are adapted to slide the teeth 42 of amaster wheel 43. Each computing wheel is constantly in mesh with acarry-over wheel 44, by which it may be turned when the computing wheelnext lower in denomination should carry over, viz., when said lowercomputing wheel brings its zero to the sight opening 45 of thetotalizer.

.To accomplish this result each computing wheel 40 is provided with abroad tooth 46, which once in each revolution of said wheel 40 (at thetime the Zero on its numeral wheel 3 turns to the sight opening 45) willenga-ge one of tive teeth 47, forming part of the adjacent carry-overwheel 44, and give said carry-over wheel a slight turn so thatinterrupted gear teeth 48 on said wheel will en gage a resilientcarry-over assisting roll 49, said roll being fast on a power drivenshaft 50 connected to the motor. The turning given each carry-over wheelby the broad tooth 46 of the computing wheel is insufficient to do morethan start the carry-over wheel, but the turning of the carry-over wheelthrough one-fifth of a revolution is completed by the carryoverassisting roll 49, said roll being provided with teeth 51 which engagethe teeth of the interrupted gear teeth 48 on the carry-over wheel andturn said carry-over wheel until another interrupted portion of the gear48 is adjacent the assisting roll 49. Each carry-over wheel is half thesize of the computing wheel with which it meshes, so that turning acarry-over wheel through a fifth of a revolution turns its computingwheel a tenth of a revolution, viz., turns it to'bring a numeralopposite the sight opening adjacent lthe numeral previously shown there.

Overthrow of the carry-over Wheels is prevented'by a spring-presseddetent roller 52', of which there is one for each carry-over wheel, saidrollers bearing against hollows 53 formed in the interrupted portions ofthe interrupted gear 48. Said detent rollers 53 not only serve tokprevent overthrow of the carry-over wheels, but since each carry-overwheel is constantly in mesh with its numeral wheel, each detent roll 53will hold its numeral wheel 3 alined.v

Variations may be resorted to within the scope of the invention, andportions of the improvements 4may be used without others. IsIaving thusdescribed my invention, I claim:

il. In a computing machine, the combination with a carriage having twototalizers thereon, of a shaft having two master wheels, means foroperating said totalizers simultaneously by said master wheels to add onone'totalizer and subtract on the other, nd means for'cross-footing theadded numers. 2. In a computing machine, the combination with a carriagehaving two totalizers thereon, of a shaft having two mast-er wheels=thereon, means for operating said master wheel shafts, and means forproducing rela tiv'e movement between said totalizers and master wheels,so that one totahzer 1s opv erated by one master wheel while the othermaster wheel is idle, and so that the other totalizer is operated by thefirst `master wheel and the first totalizer is operated by thepreviously idle master wheel, so as to simultaneously add in onetotalizer and subtract in the other when the carriage and totalizersoccupy a different position.

3. The combination with two totalizers and a master wheel shaft, ofmaster wheels on said shaft for operating said totalizers simultaneouslyso that one will add and the other subtract, a cross totalizer, a singleseparate master wheel for said cross totalizer, and means for connectingthe mas ter wheel of said cross totalizer to add or subtractindependently of the other master wheels but simultaneously therewith.

4. The combination with a typewriter carriage, of a computing carriageconnected thereto, a sub-totalizer, a grand totalizer, a shaft havingmaster wheels for operating said totalizers, said computing carriagebeing connected to effect relative movements between each master wheeland the totalir-A ers, a. cross totalizer, a computing carriageindependently connected to effect relative movements between said crosstotalizer and its master wheel, means for connecting said two computingcarriages so that they move simultaneously, said sub-totalizer and grandtotalizer being so connected to be operated by their master wheels thatone always avutomatically adds when the other subtracts when both areengaged by their master wheels, and means for manually determiningwhether the subtotalizer shall add or subtract. l

5. In a com'bined typewriting and computing machine, the combinationwith two totalizers,'of master wheels arranged to engage themsuccessively and simultaneously, the parts of said totalizers being soarranged that when they are operated together one will add while theother subtracts, a single shaft to which said master wheels are fast, across totalizer adaptedvto be connected intermittently to be operatedsimultaneously with either of said first totalizers, means for reversingsaid single shaft, and means for separately reversing said crosstotalizer.

6. In a combined typewriting and computing machine, the combination withtwo totalizer's, of common controlling means for reversibly operatingthem together so that one automatically adds while the other subtracts,one of said totalizers being operable independently of the other, athird totalizer automatically connectible to be operable simultaneouslywith one of said two totalizers to add, means for separately operatingsaid thirdtotalizer. to subtract, and numeral keys forming part of saidtypewriting machine and controlling the operation of said totalizers.

7; The combination with a unitary pair of removably adjustabletotalizers, of a single shaft for operating said totalizers, a masterwheel for each totalizer fast on said shaft, wheels in said totalizersso arranged that if the two totalizers are operated simultaneously bysaid shaft, one of said totalizers always adds if the other subtracts, across totalizer operable simultaneously with either or both of saidtotalizers, manual means settable to determine whether said crosstotalizer shall add or subtract, and typewriting means for so operatingsaid totalizers.

, 8. In a combined typewriting Aand computing machine, the combinationwith a platen, of totalizers arranged to add or subtract numbers writtenin definite columns on said platen, a master wheel shaft and mais; terwheels on said shaft for automatically o erating said totalizerssimultaneously so t at one adds while the other subtracts, said masterwheels also adapted to operate one of said totalizers independently ofthe other to either add or subtract, a cross totalizer manually settableto add or subtract, and means for automatically connecting said crosstotalizer to be operated simultaneously with one of said first-namedtotalizers while said totalizer adds, said cross totalizer alsoconnectible separately to add or subtract.

9. Ina combined typewriting and coinputing machine, the combination witha computing machine carriage and two totalizers thereon, of a singleshaft for operatingsaid two totalizers, a master wheel for eachtotalizer fast on said shaft, means for simultaneously turning saidshaft and printing the numbers represented by the turning of said shaft,a separate totalizer having a separate shaft adapted to be similarlyturned while printing, means for manually separately setting said shaftconnections to turn the shafts in either direction when printing isdone, and means whereby when said iirst two tota-lizers are operatedsimultaneously, one will always subtract while the other is adding, andvice versa.

10. In a combined typewriting and computing machine, the combinationwith a typewriter carriage, of a computing carriage, two totalizers, asingle shaft, two master wheels fast on said shaft, said computingcarriage adapted to cause said master wheels to engage computationwheels sera-tim in each of said totalizers, said inaster wheels sorelated to said totalizers that if they each engage a totalizer, onetotalizer is adding and the other subtracting, a second computingcarriage connectible intermittently to travel step by step with thefirst computing carriage, a third totalizer, a third master wheelengaging sefiatz'mthe computation members of said third totalizer ascontrolled by said second computing carriage, a drive shaft for drivingsaid master wheels, and reversible connections between said drive shaftand said master wheel shaft and said third master wheel..

1 1. In a computing machine, the combination with a traveling carriage,of two totalizers, and master wheels for operating sald two totalizers,said master wheels being on a single shaft and so related to saidtotalizers that when one adds the other sub-,

tracts when they are operated simultaneously.

1 2. In a computing machine, the combination w1th a traveling carriage,of two totalizers, master wheels for operating said two totalizers, saidmaster wheels being on a single shaft and so related to said totallzersthat when one adds the other automatically subtracts if they areoperated simultaneously, one of said totalizers also adapted to beoperated independently of the other by one of said master wheels, and across totalizer adaptedy tol be successively operated in eitherdirection simultaneously with at least one of said totalizers.

13. In a computing machine, the combination with a master wheel drivingshaft, a master wheel thereon, of two totalizers arranged to be operatedone after the other by said master wheel, a second master wheel on saidshaft for operating one of said totalizers simultaneously with theoperation of the other totalizer by the first mentioned master wheel,the numbers on one of said totalizers running the reverse of the numberson the other, a cross totalizer and means for determining at any timewhether said cross totalizer shall register additively or subtractivelyin connection with either or both of said first mentioned totalizers. i

lli. The combination with a pair of totalizers, each including aplurality of computing wheels, the numbers ascending in one direction onthe wheels of one of said totalizers and ascending in the oppositedirection on the wheels of the other of said totalizers, and meansoperated under a common control. for simultaneously actuating saidtotalizers in unison to run up the same digits thereon, said means alsoadapted to operate one of said totalizers while ineffective on theother.

l5. The combination with a unitary pair of twin totalizers each having.a series of number wheels, the digits ascending in opposite directionson the number wheels of the two totalizers held in definite relationwith respect to each other, of a pair of master wheels, a shaft fordriving said master wheels, said master wheels being fiXed on said shaftat a definite spaced relation corresponding to the spaced relation ofthe center lines of said twin totalizers, and traversing means forelfecting a relative movement between said totalizers and said masterwheels, so that one of said master wheels will first drive one of saidtotalizers, and then drive the other of said totalizers, while the otherof said master wheels drives the first totalizer.

I6. The combination with a unitary pair of twin totalizers held indefinite relation with respect to each other, of a pair of mas terwheels, a shaft for driving said master wheels, said master wheels beingfxed'on said shaft at a definite spaced relation corresponding to thespaced relation of the center lines of said twin totalizers, saidtotalizers and master wheels being so arranged that one totalizer addswhile the other subtracts, traversing means for effecting a relativemovement between said totalizers and said master wheels, so that one ofsaid masterwheels will first drive one of said totalizers, and thendrive the other of said totalizers, while the other of said inasterwheels drives the rst totalizer, a cross totalizer, means settable toautomatically cause said cross totelizer to operate with either o1' bothof said unitary totalizers, and manual .ineens adjustable to cause saidcross totalizer to add or subtract.

17. The combination With a grand totalizer and an item totalizer each ofsaid total'- izers having numeral Wheels, the digits ascending inopposite directions on the Wheels of the tWo totalizers, of masterWheels connected for rotation together in the same direction foroperating said totalizers either simultaneously or individually, a crosstotalizer, a single master Wheel therefor, means whereby said crosstotalizer may either add or subtract or remain idle When the first ofsaid totalizers is adding or subtracting.

FRANK A. ROBINSON.

Witnesses:

GEO. W. NAYLOR7 JULIUS DUCKSTINE.

Copies of this patent may be obtained for ve cents each, by addressingthe Commissioner of Patents, Washington, D. C.

